TY - JOUR
KW - paper
AU - Hans-Christian Weissker
AU - J Serrano
AU - Simo Huotari
AU - Fabien Bruneval
AU - Francesco Sottile
AU - G Monaco
AU - M Krisch
AU - Olevano V
AU - Lucia Reining
AB - We present an investigation of the dynamic structure factor and of the dielectric function epsilon(M)(Q,omega) of the prototypical semiconductor silicon for finite momentum transfer, combining inelastic x-ray scattering experiments and ab initio calculations. In contrast with optical spectra, for finite momentum transfer time-dependent density-functional theory in the adiabatic local-density approximation together with lifetime broadening describes the physics of valence excitations correctly. Major structures in the spectra, governed by short-range crystal and exchange-correlation local-field effects, are strongly influenced by a mixing of transitions of positive and negative energies, in striking difference to spectra for vanishing momentum transfer. This mixing gives rise to a pronounced Fano asymmetry.
BT - Phys. Rev. Lett.
CY - ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
DA - DEC 8
DO - 10.1103/PhysRevLett.97.237602
M1 - 23
N2 - We present an investigation of the dynamic structure factor and of the dielectric function epsilon(M)(Q,omega) of the prototypical semiconductor silicon for finite momentum transfer, combining inelastic x-ray scattering experiments and ab initio calculations. In contrast with optical spectra, for finite momentum transfer time-dependent density-functional theory in the adiabatic local-density approximation together with lifetime broadening describes the physics of valence excitations correctly. Major structures in the spectra, governed by short-range crystal and exchange-correlation local-field effects, are strongly influenced by a mixing of transitions of positive and negative energies, in striking difference to spectra for vanishing momentum transfer. This mixing gives rise to a pronounced Fano asymmetry.
PB - AMERICAN PHYSICAL SOC
PP - ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
PY - 2006
EP - 237602
T2 - Phys. Rev. Lett.
TI - Signatures of short-range many-body effects in the dielectric function of silicon for finite momentum transfer
UR - http://dx.doi.org/10.1103/PhysRevLett.97.237602
VL - 97
ER -